Introducing RIC70847, an innovative rad hard buck controller for space applications

IR HiRel is excited to announce the RIC70847, a radiation-hardened synchronous buck controller designed for harsh environments, such as space applications. It features integrated gate drivers and is specified for operation up to 100 krad(Si) total ionizing dose and single event effects (SEE) up to 81.9 MeV·cm²/mg linear energy transfer.

The integrated half bridge gate driver has a 5 V drive voltage and is intended to work with logic level FET, such as rad hard R8 power FETs.  RIC70847 supports a wide input voltage range of 4.5 V to 17.1 V, and the output voltage can vary from 0.6 V to 90% of the input voltage.  This makes RIC70847 ideal for point of load (PoL) applications such as core rails of space rated FPGA and ASIC.  

RIC70847
RIC70847
RIC70847

Key features

  • Wide supply and power voltage range for flexible design
  • High-accuracy voltage reference ensures stability over voltage, temperature, and radiation Enhanced transient response with optional load line regulation for improved performance
  • Fixed frequency peak current mode control for reliable operation
  • Programmable switching frequency (wide range) for optimized size and performance
  • High step-down voltage ratio capability with small minimum on-time
  • Integrated half-bridge gate driver for simplified design
  • Comprehensive integrated fault protections for enhanced reliability
  • Integrated programmable soft start for controlled power-up

Packaging information

  • Available in a hermetically-sealed 24-lead flatpack or die form which enables the device to operate over the full military ambient temperature range of -55°C to 125°C 

Target applications

  • PoL converter for space grade FPGA, ASIC and DSP core rails
  • Digital processing payload systems
  • Distributed satellite power systems